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1-(2r+4r²-1-2r)<2r-(4r²+4r+1)
1-4r²-1<-2r-4r²-1|+4r²
1<-2r|: (-2)
r<-1/2
r-4r-2/3>r-6 |*3
3r-12r-2>r-6
-9r-2>r-6|+6
-9r+4>r|+9r
4>10r|:10
r<2/5